Expandable seating furniture

1. An expandable seating furniture comprising:

a center section providing one or more first seating places along a single seating plane, the center section providing center chair legs and a center back support, the center section providing a cushion-storage compartment accessible from the front of the furniture;

at least one lateral section, concealable into the center section, each of the at least one lateral section being laterally expandable for providing one or more additional seating places along a single seating level, wherein the center section conceals a back portion for each of the at least one lateral section when the expandable seating furniture is unexpanded, wherein the center section and the at least one lateral section provide cooperating expandable mechanical connections, the cooperating expandable mechanical connections defining the single seating level along the single seating plane whether the furniture is expanded or unexpanded and wherein the cushion-storage compartment is located under the cooperating expandable mechanical connections;

one or more identical cushions for the one or more additional seating places concealable into the cushion-storage compartment of the center section when the expandable seating furniture is unexpanded; and

wherein each of the one or more additional seating places, when expanded, is provided with a back portion that was previously concealed in the center section.

2. The expandable seating furniture of claim 1 , wherein the cooperating expandable mechanical connections comprise two or more interleaved sliding sections concealable into the center section.

3. The expandable seating furniture of claim 2 , wherein the interleaved sliding sections are stacked over one another along the single seating plane when the expandable seating furniture is unexpanded.

4. The expandable seating furniture of claim 2 , wherein one of the interleaved sliding sections, when expanded in a first direction, is supported by at least one of the lateral chair legs and at least one of the center chair legs.

5. The expandable seating furniture of claim 4 , wherein a second one of the interleaved sliding sections, when expanded in the first direction, is supported by at least two of the lateral chair legs, at least one of the at least two of the lateral chair legs being the at least one lateral chair supporting the first one of the interleaved sliding sections.

6. The expandable seating furniture of claim 2 , wherein parallel slots are provided between the center section and the interleaved sliding sections along the single seating plane when the expandable seating furniture is unexpanded.

7. The expandable seating furniture of claim 6 , wherein additional parallel slots and cooperating rods are provided between the interleaved sliding sections along the single seating plane.

8. The expandable seating furniture of claim 6 , wherein at least some of the parallel slots are juxtaposed next to one another.

9. The expandable seating furniture of claim 6 , wherein a first one of the interleaved sliding sections expanded in a first direction is supported by at least one of the lateral chair legs and at least one of the center chair legs.

10. The expandable seating furniture of claim 9 , wherein a second one of the interleaved sliding sections expanded in the first direction is supported by at least two of the lateral chair legs, at least one of the at least two of the lateral chair legs being the at least one lateral chair supporting the first one of the interleaved sliding sections.

11. The expandable seating furniture of claim 2 , wherein parallel slots and cooperating rods are provided between the center section and the interleaved sliding sections along the single seating plane when the expandable seating furniture is unexpanded.

12. The expandable seating furniture of claim 11 , wherein at least some of the parallel slots and cooperating rods act together as rods for additional cooperating parallel slots along the single seating plane.

13. The expandable seating furniture of claim 1 , further comprising arm rests, wherein at least one of the cushions is concealable in the arm rests.

14. The expandable seating furniture of claim 13 , wherein the cushions are selectively concealable in the arm rests and into the cushion-storage compartment.

15. An expandable seating furniture comprising:

a center section providing one or more first seating places along a single seating plane, the center section providing center chair legs and a center back support;

at least one lateral section, concealable into the center section, each of the at least one lateral section being laterally expandable for providing one or more additional seating places along the single seating plane, wherein the center section conceals a back portion for each of the at least one lateral section when the expandable seating furniture is unexpanded;

one or more cushions for the one or more additional seating places concealable into the center section when the expandable seating furniture is unexpanded;

wherein each of the one or more additional seating places, when expanded, is provided with a back portion that was previously concealed in the center section;

a corner section, wherein the center section is provided on a first lateral side of the corner section;

a second center section provided on a second lateral side of the corner section; and

one or more second lateral sections, concealable into the second center section, each of the second lateral sections being laterally expandable for providing one or more second additional seating places.

16. An expandable seating furniture comprising:

a center section providing one or more first seating places along a single seating plane, the center section providing center chair legs and a center back support;

at least one lateral section, concealable into the center section, each of the at least one lateral section being laterally expandable for providing one or more additional seating places along the single seating plane, wherein the center section conceals a back portion for each of the at least one lateral section when the expandable seating furniture is unexpanded;

one or more cushions for the one or more additional seating places concealable into the center section when the expandable seating furniture is unexpanded;

wherein each of the one or more additional seating places, when expanded, is provided with a back portion that was previously concealed in the center section; and

wherein armrests of the lateral sections are concealed into armrests of the center section when the expandable seating furniture is unexpanded.